Newb question: Random Serial

[77T]

Serial numbers mean something to hardcore collectors who want to own a watch that may have been the "first in line" or "last one out the door". Think of it like a classic car - one with "matching numbers" is more rare than others of same vintage.

For example, in the day, a rare model and a serial number approximated a year - when that is cross-referenced to the proper bracelet code and clasp code and original dial, then it might be an iconic Rolex.